Transmit Signal Power Variation Detection Under Antenna Mismatch
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Solution Overview
Problem
Existing power amplifiers in mobile terminals face challenges in maintaining consistent power transmission due to varying antenna impedances caused by environmental conditions, leading to inefficiencies and increased design complexity, particularly when not optimized for 50Ω conditions.
Innovation Solution
An apparatus comprising a power amplifier module, an antenna module, and a power variation determining module that calculates a weighted sum of feedback signals with different dependencies on antenna impedance, generating a power variation signal to minimize the impact of impedance variations, allowing for efficient power control and reduced mismatch effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power amplifiers are optimized for 50Ω conditions, then power transmission efficiency is improved, but adaptability to varying antenna impedances deteriorates
Solution Approach 1:
The patent implements dynamic impedance matching by continuously measuring the actual antenna impedance and adjusting the matching network parameters in real-time. This allows the power amplifier to maintain optimal power transmission efficiency across varying antenna impedance conditions, resolving the contradiction between efficiency optimization and adaptability.
Solution Approach 2:
The system changes the impedance parameters of the matching network dynamically based on measured antenna conditions. By adjusting resistance, inductance, and capacitance values in the matching network, the system adapts to different antenna impedances while maintaining efficient power transfer, thus resolving the contradiction between fixed-optimization and adaptability.
2Device complexity
If power amplifiers are designed without considering mismatch, then device complexity is reduced, but power variation into mismatch increases
Solution Approach 1:
The patent employs feedback mechanisms where the measured antenna impedance and power variation information are fed back to the control system. This feedback enables automatic adjustment of the matching network to minimize power variation into mismatch, achieving reliable performance without significantly increasing design complexity through standardized feedback circuits.
Solution Approach 2:
The system performs self-adjustment by automatically measuring its own operating conditions and correcting impedance mismatches without external intervention. This self-service capability reduces the need for complex manual tuning and external control systems while maintaining low power variation into mismatch.
3Power
If antenna matching is optimized for specific conditions, then power transmission is improved, but ease of operation deteriorates due to environmental sensitivity
Solution Approach 1:
The patent implements dynamic adaptation that automatically adjusts to environmental changes affecting antenna impedance. The system continuously monitors and re-optimizes the matching network parameters, maintaining high power transmission without requiring manual reconfiguration, thus preserving ease of operation despite environmental sensitivity.
Solution Approach 2:
The antenna matching system performs self-optimization by automatically detecting environmental-induced impedance changes and adjusting the matching network accordingly. This eliminates the need for manual intervention to maintain optimal power transmission under varying operational conditions, preserving ease of operation.
Data Source
AI summary
An apparatus for determining information on a power variation of a transmit signal comprises a power amplifier module, an antenna module and a power variation determining module. The power amplifier module amplifies a radio frequency transmit signal and the antenna module transmits at least partly the amplified radio frequency transmit signal. The power variation determining module determines a weighted sum of a first feedback signal derived from the amplified radio frequency transmit signal and a second feedback signal derived from the amplified radio frequency transmit signal. The first feedback signal and the second feedback signal comprise different dependencies on a varying impedance at the antenna module. Further, the power variation determining module generates a power variation signal based on the weighted sum. The power variation signal comprises information related to a power variation of the amplified radio frequency transmit signal.